使用CASE和IN更新 - Oracle

Question

我写了一个像SQL Server中的魅力一样的查询.不幸的是,它需要在Oracle数据库上运行.我一直在网上搜索有关如何转换它的解决方案,但没有任何成功:/

查询看起来像这样我的SQL:

UPDATE tab1   SET budgpost_gr1=     
CASE  WHEN (budgpost in (1001,1012,50055))  THEN 'BP_GR_A'   
      WHEN (budgpost in (5,10,98,0))  THEN 'BP_GR_B'  
      WHEN (budgpost in (11,876,7976,67465))     
      ELSE 'Missing' END`

我的问题还在于,柱子budgetpost_gr1和预算邮件是字母数字,Oracle似乎希望将列表视为数字.该列表是预定义为逗号分隔列表的变量/参数,它们只是转储到查询中.

Answer 1

你说预算邮件是字母数字.这意味着它正在寻找与字符串的比较.您应该尝试将参数括在单引号中(并且您在Case表达式中缺少最后的THEN).

UPDATE tab1   
SET budgpost_gr1=   CASE  
                        WHEN (budgpost in ('1001','1012','50055'))  THEN 'BP_GR_A'   
                        WHEN (budgpost in ('5','10','98','0'))  THEN 'BP_GR_B'  
                        WHEN (budgpost in ('11','876','7976','67465')) THEN 'What?'
                        ELSE 'Missing' 
                        END 

Answer 2

得到了一个可以运行的解决方案。但不知道这是否是最佳的。我所做的是根据http://blogs.oracle.com/aramamoo/2010/05/how_to_split_comma_separated_string_and_pass_to_in_clause_of_select_statement.html分割字符串

使用：
select regexp_substr(' 1, 2 , 3 ','[^,]+', 1, level) from dual
connect by regexp_substr('1 , 2 , 3 ', '[^,]+', 1, level) is not null;

所以我的最终代码如下所示（$bp_gr1'是类似的字符串1,2,3）：

UPDATE TAB1
SET    BUDGPOST_GR1 =
          CASE
             WHEN ( BUDGPOST IN (SELECT     REGEXP_SUBSTR ( '$BP_GR1',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                 FROM       DUAL
                                 CONNECT BY REGEXP_SUBSTR ( '$BP_GR1',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                               IS NOT NULL) )
             THEN
                'BP_GR1'
             WHEN ( BUDGPOST IN (SELECT     REGEXP_SUBSTR ( ' $BP_GR2',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                 FROM       DUAL
                                 CONNECT BY REGEXP_SUBSTR ( '$BP_GR2',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                               IS NOT NULL) )
             THEN
                'BP_GR2'
             WHEN ( BUDGPOST IN (SELECT     REGEXP_SUBSTR ( ' $BP_GR3',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                 FROM       DUAL
                                 CONNECT BY REGEXP_SUBSTR ( '$BP_GR3',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                               IS NOT NULL) )
             THEN
                'BP_GR3'
             WHEN ( BUDGPOST IN (SELECT     REGEXP_SUBSTR ( '$BP_GR4',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                 FROM       DUAL
                                 CONNECT BY REGEXP_SUBSTR ( '$BP_GR4',
                                                            '[^,]+',
                                                            1,
                                                            LEVEL )
                                               IS NOT NULL) )
             THEN
                'BP_GR4'
             ELSE
                'SAKNAR BUDGETGRUPP'
          END;

有没有办法让它跑得更快？